Alacritty Theme Synchronization

Simple theme synchronization for Alacritty that automatically switches between Catppuccin light and dark themes based on your macOS system theme.

This solution uses Nix conditional configuration - no complex scripts or wrappers needed!

How It Works

The system detects your current macOS theme using defaults read -g AppleInterfaceStyle
The theme is written to /Users/danny/.local/share/nvim_color_scheme
Your NixOS configuration reads this file and conditionally applies:
- Light theme → Catppuccin Latte
- Dark theme → Catppuccin Mocha
Alacritty gets the correct theme colors through Nix configuration

Setup

Run the setup script:
```
./scripts/setup-simple-theme-sync.sh
```
Apply the theme to Alacritty:
```
home-manager switch
```

That's it! Your Alacritty will now use the correct theme based on your system theme.

Usage

Manual Theme Sync

When you change your system theme, run:

./scripts/sync-alacritty-theme.sh && home-manager switch

Automatic Theme Switching (Optional)

For automatic switching, you can set up a LaunchAgent:

cp assets/launchd/com.user.alacritty-theme-sync.plist ~/Library/LaunchAgents/
launchctl load ~/Library/LaunchAgents/com.user.alacritty-theme-sync.plist

Files

scripts/detect-system-theme.sh - Detects current macOS system theme
scripts/sync-alacritty-theme.sh - Updates the theme file that Nix reads
scripts/setup-simple-theme-sync.sh - One-time setup script
nixos/home/danny/home.nix - Contains the conditional Alacritty configuration

Theme Colors

Catppuccin Latte (Light)

Background: #eff1f5 (base)
Foreground: #4c4f69 (text)
Accent colors optimized for light backgrounds

Catppuccin Mocha (Dark)

Background: #1e1e2e (base)
Foreground: #cdd6f4 (text)
Accent colors optimized for dark backgrounds

Integration with NixOS

The solution uses Nix's conditional configuration in home.nix:

colors = let
  systemThemeFile = "/Users/danny/.local/share/nvim_color_scheme";
  isLightTheme = builtins.pathExists systemThemeFile && 
                 builtins.readFile systemThemeFile == "light\n";
  
  lightColors = { /* Catppuccin Latte colors */ };
  darkColors = { /* Catppuccin Mocha colors */ };
in if isLightTheme then lightColors else darkColors;

This approach:

✅ Works with Spotlight/Applications folder launches
✅ No shell aliases or wrapper scripts needed
✅ Integrates cleanly with NixOS configuration
✅ Minimal complexity - just 3 simple scripts
✅ Uses the same theme file as your Neovim configuration

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